I am implementing the ICallbackEventHandler interface, and one of its members
methods in a server control as follows :
public void RaiseCallbackEvent(string eventArgument)
    {
        if (eventArgument != "")
        {

            result += tmp1.ToString() + "), new Array(" + tmp2.ToString() + "));";
            return result;
        }
        else
        {
            return "showQueryDiv" + JS_suffixe + "('" + eventArgument + "', new
Array(), new Array());";
        }
        //throw new Exception("The method or operation is not implemented.");
    }

Yhe other method which I dont use as follows
public string GetCallbackResult()
    { }

When I compile I get the following erros

"Since 'contact_project.RaiseCallbackEvent(string)' returns void, a return
keyword must not be followed by an object expression"
and the second error
"contact_project.GetCallbackResult()': not all code paths return a value'


Thanks for your help

I forgot to say that initially, I wanted my my raise event to return a
string, when I do
       public string RaiseCallbackEvent(string eventArgument)
                      {}
then compile, I get the following error

'contact_project' does not implement interface member
'System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent(string)'.
'add_contact_project.RaiseCallbackEvent(string)' is either static, not
public, or has the wrong return type.       

Thanks again

Show quoteHide quote

Hi Salam,

Thank you for posting.

Regarding on the ASP.NET 2.0 script call back issue, based on my research,
it seems a document issue. As for the ICallBackEventHandler interface, it
contains two member functions we need to implement:

#ICallbackEventHandler Methods
http://msdn2.microsoft.com/en-us/library/dcc3kkye.aspx

The "RaiseCallbackEvent" function does not have return value, so we can not
return any data in this function. If we need to return data to client-side,
we need to use the "GetCallbackResult" function. e.g:

_cbResult is a page member variable
=====================================
#region ICallbackEventHandler Members

    public string GetCallbackResult()
    {
        return _cbResult;

    }

    public void RaiseCallbackEvent(string eventArgument)
    {
        _cbResult = eventArgument + "__" +  DateTime.Now.ToLongTimeString();


    }

    #endregion
==============================

Hope this helps. And sorry for the inconvenience the document problem
brings you.

Regards,

Steven Cheng
Microsoft Online Community Support


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